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Parameters of Japanese Level 3 Distribution Box

Parameters of Japanese Level 3 Distribution Box

A Japanese Level 3 distribution box is the final junction box for electrical appliances, integrating power distribution, protection, control, and reactive power compensation with IP54 protection and multi-functional safety features.OverviewThe Level 3 distribution box in Japan refers to the final junction box for each electrical appliance, which can be either movable or fixed. It is installed downstream of the main and secondary distribution boxes and includes the last stage of leakage protection, ensuring that each connected appliance is individually protected . This setup follows the principle of “one machine, one switch, one leakage, one box, one lock”, preventing multiple devices from being controlled by a single switch .Electrical and Functional ParametersVoltage Level: Designed for low-voltage systems below 0.4 kV, compatible with Japanese 3-phase 200V/210V systems .Protection Functions: Includes short-circuit, overload, over-voltage, under-voltage, leakage, phase loss, and zero-sequence overrun protection .Reactive Power Compensation: Supports both three-phase and single-phase compensation, with capacities ranging from 20 kVar to 180 kVar, and fast response times ≤20 ms .Switching Modes: Manual and automatic switching operations are available, allowing flexible control of connected loads .Metering and Control: Integrated metering chambers with lead sealing devices, and control functions for outgoing circuits .Structural and Environmental SpecificationsMaterial: High-quality steel or stainless steel with multi-fold flanging or double sandwich plate construction for flame retardancy, heat insulation, and anti-condensation .Protection Grade: IP54, providing dust and water resistance suitable for outdoor pole-mounted installation .Temperature Range: -25°C to +40°C, with relative humidity up to 90% daily average .Elevation: Suitable for installation up to 2000 meters above sea level .Design Features: Front and back doors with high-elasticity, aging-resistant sealing strips, equipped with common and anti-theft locks; ventilation channels and cable sleeves to prevent ingress of rain and foreign matter .Installation and ApplicationMounting: Typically installed on outdoor pole-mounted transformers, forming part of urban and rural power grid transformation projects .Applications: Suitable for substations, industrial plants, high-rise buildings, residential communities, and other scenarios requiring reliable low-voltage power distribution .Modular Design: Allows flexible feeder circuit configurations and easy maintenance .SummaryThe Japanese Level 3 distribution box is a highly integrated, safe, and reliable low-voltage distribution solution, combining power distribution, protection, control, metering, and reactive power compensation in a compact, weather-resistant, and secure enclosure. It ensures final-stage protection for individual appliances, making it essential for modern construction, industrial, and urban electrical systems .

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